Remove an application from the cmd-tab switcher on macOS

At work, I use iTerm2 as my main terminal emulator. For quick access, I have it configured to drop down from the top of the screen when F12 is pressed.

Unfortunately, it also shows up in the application switcher, bumping up into the 'last used' position whenever it's activated and getting in the way. Since I already have access to the terminal via F12, there's no need for it to be shown in the application switcher as well.

Changing how an application behaves can be done by editing its Info.plist file. The key LSUIElement (according to the Apple documentation) "Specifies whether the app is an agent app, that is, an app that should not appear in the Dock or Force Quit window."

To set this key, open the application's Info.plist at /Applications/[application name].app/Contents/Info.plist and add <key>LSUIElement</key><true/> after the first <dict> tag. The result should look something like this:

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>LSUIElement</key><true/>
    <!-- The rest of the plist data -->
</dict>
</plist>

Once the LSUIElement key is set to true, relaunch the application to see the changes.

Be warned that not only does this remove the application from the application switcher, it also removes it from the dock and stops it from showing the menu bar on the top of the screen.